The Second World War was started by Germany in an unprovoked attack on Poland. Britain and France declared war on Germany after Hitler had refused to abort his invasion of Poland.
<span>u.s. entry into WWI caused industrial psychologists to begin working with the military.After entering into world war-I there is a need for U.S to train their military and develop the army's strength and capability.Psychological research and treatment are important to national defense. Research can show how to improve military training, job assignment and equipment design. Treatment can help personnel cope with stress. Psychologists conduct research on human behavior and treat patients with mental problems. so,industrial psychologists to begin working with the military.</span>
Answer: it gave enslaved people their freedom
Explanation: That was the whole point of the Emancipation Proclamation
